# 定义变量
name = '张三'


# 定义函数
def mul(a, b):
    return a * b


# 定义类
class Person:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def __str__(self):
        return 'name:{},age:{}'.format(self.name, self.age)

print("utils.py: __name__ = ", __name__)